I had a 2005 Cobra 29LTD classic brought to me.... initially to have the channel display replaced. The original was missing a few of segments. Prior to doing any work I bench tested the radio into my dummy load and it seemed to transmit just fine and on frequency. I replaced the channel display with a stock one from a 29LTD. Once it was put all back together, I turned it on and flipped thru every channel to make sure the display read correctly and had no drop offs. Everything looked great. I then hooked my coax from my dummy load up to it and turned it back on to transmit into the dummy load. As soon as I screwed the collar from the PL259 on to the SO239 the display read ch28 when I was on ch20. The radio keys and puts out power but on ch40. I thought what the heck. I undid the coax thinking something was causing the radio the short...so as a test...I hooked a alligator test lead from the center of the SO239 to ground thinking it would do the same thing but it didn't. The display read correctly. I have never EVER seen a Cobra29 do this before and have no idea why its doing that. Does anybody have some insight into what may be causing this "possession" ?